Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits	$ 508	$ 592	$ 646	$ 502	$ 723	$ 638
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax			(33)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change			(44)
Net Reinsurance Recoverables	6,930		6,524	6,964	6,013
Deferred income taxes, net	1,260		281	1,437	64
Retained earnings	17,454		15,770	17,058	13,918
Accumulated other comprehensive income (loss) ("AOCI"), net of tax	(3,254)		128	(3,841)	1,105
Stockholders' Equity Attributable to Parent	14,340	15,890	17,805	13,676	18,491
Policyholder Benefits and Claims Incurred, Net	3,482	3,120
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	653	541
Income tax expense	118	98
Net income	535	443
Net income available to common stockholders	$ 530	$ 438
Net income available to common stockholders	$ 1.69	$ 1.32
Net income available to common stockholders	$ 1.66	$ 1.30
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			596	561	638
Net Reinsurance Recoverables			6,523	6,966	6,011
Deferred income taxes, net			270	1,449	46
Retained earnings			15,764	17,048	13,918
Accumulated other comprehensive income (loss) ("AOCI"), net of tax			172	(3,876)	1,170
Stockholders' Equity Attributable to Parent			17,843	13,631	18,556
Policyholder Benefits and Claims Incurred, Net		$ 3,118
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		543
Income tax expense		98
Net income		445
Net income available to common stockholders		$ 440
Net income available to common stockholders		$ 1.32
Net income available to common stockholders		$ 1.30
Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			50	(59)	85
Net Reinsurance Recoverables			1	(2)	2
Deferred income taxes, net			11	(12)	18
Retained earnings			6	10	0
Accumulated other comprehensive income (loss) ("AOCI"), net of tax			(44)	35	(65)
Stockholders' Equity Attributable to Parent			(38)	$ 45	(65)
Policyholder Benefits and Claims Incurred, Net		$ 2
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		(2)
Income tax expense		0
Net income		(2)
Net income available to common stockholders		$ (2)
Net income available to common stockholders		$ 0
Net income available to common stockholders		$ 0
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					85
Net Reinsurance Recoverables					2
Deferred income taxes, net					18
Accumulated other comprehensive income (loss) ("AOCI"), net of tax					(65)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Removal of shadow reserve
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					(26)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Update cash flow assumptions and establish DPL
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Effect of measurement at current single-A rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					111
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			646		723
Fixed Annuity
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits	$ 143	$ 169				189
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax			(11)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change			(7)
Fixed Annuity | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					17
Fixed Annuity | Cumulative Effect, Period of Adoption, Adjustment [Member] | Removal of shadow reserve
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					(26)
Fixed Annuity | Cumulative Effect, Period of Adoption, Adjustment [Member] | Update cash flow assumptions and establish DPL
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					(16)
Fixed Annuity | Cumulative Effect, Period of Adoption, Adjustment [Member] | Effect of measurement at current single-A rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					59
Fixed Annuity | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			188		206
Life Conversions
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits	67	84				94
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax			(7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change			(14)
Life Conversions | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					21
Life Conversions | Cumulative Effect, Period of Adoption, Adjustment [Member] | Removal of shadow reserve
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Life Conversions | Cumulative Effect, Period of Adoption, Adjustment [Member] | Update cash flow assumptions and establish DPL
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Life Conversions | Cumulative Effect, Period of Adoption, Adjustment [Member] | Effect of measurement at current single-A rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					21
Life Conversions | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			94		115
Paid Up Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits	192	234				267
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax			(15)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change			(17)
Paid Up Life | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					27
Paid Up Life | Cumulative Effect, Period of Adoption, Adjustment [Member] | Removal of shadow reserve
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Paid Up Life | Cumulative Effect, Period of Adoption, Adjustment [Member] | Update cash flow assumptions and establish DPL
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					(2)
Paid Up Life | Cumulative Effect, Period of Adoption, Adjustment [Member] | Effect of measurement at current single-A rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					29
Paid Up Life | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			262		294
Deferred Profit Liability
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits	19	20				0
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax			0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change			2
Deferred Profit Liability | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					18
Deferred Profit Liability | Cumulative Effect, Period of Adoption, Adjustment [Member] | Removal of shadow reserve
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Deferred Profit Liability | Cumulative Effect, Period of Adoption, Adjustment [Member] | Update cash flow assumptions and establish DPL
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					18
Deferred Profit Liability | Cumulative Effect, Period of Adoption, Adjustment [Member] | Effect of measurement at current single-A rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Deferred Profit Liability | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			20		18
Long-Duration Insurance, Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits	$ 87	$ 85				$ 88
OCI, Liability for Future Policy Benefit, Gain (Loss), before Reclassification Adjustment and Tax			0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change			(8)
Long-Duration Insurance, Other | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					2
Long-Duration Insurance, Other | Cumulative Effect, Period of Adoption, Adjustment [Member] | Removal of shadow reserve
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Long-Duration Insurance, Other | Cumulative Effect, Period of Adoption, Adjustment [Member] | Update cash flow assumptions and establish DPL
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					0
Long-Duration Insurance, Other | Cumulative Effect, Period of Adoption, Adjustment [Member] | Effect of measurement at current single-A rate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits					2
Long-Duration Insurance, Other | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reserve for future policy benefits			$ 82		$ 90